Hollow Fibre-Supported Liquid Membrane for the Determination of Sulfonamide Residues in Egg Samples

Figure 4

Evaluation of donor phase pH. Extraction conditions: 300 μg·kg⁻¹ SAs mixture spiked in blank egg samples; hollow fibre length (4 cm); 5 mL of aqueous sample solution (pH 2.5–6.5); 6 μL of aqueous acceptor phase (pH 12); 10% TOPO in 1-octanol as an SLM; stirring rate: 400 rpm; extraction time: 60 min; and n = 5.